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/*
* Copyright (c) 2017-2021, [Ribose Inc](https://www.ribose.com).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef RNP_RNG_H_
#define RNP_RNG_H_
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include "config.h"
#ifdef CRYPTO_BACKEND_BOTAN
typedef struct botan_rng_struct *botan_rng_t;
#endif
namespace rnp {
class RNG {
private:
#ifdef CRYPTO_BACKEND_BOTAN
struct botan_rng_struct *botan_rng;
#endif
public:
enum Type { DRBG, System };
/**
* @brief Construct a new RNG object.
* Note: OpenSSL uses own global RNG, so this class is not needed there and left
* only for code-level compatibility.
*
* @param type indicates which random generator to initialize.
* Possible values for Botan backend:
* - DRBG will initialize HMAC_DRBG, this generator is initialized on-demand
* (when used for the first time)
* - SYSTEM will initialize /dev/(u)random
*/
RNG(Type type = Type::DRBG);
~RNG();
/**
* @brief Get randoom bytes.
*
* @param data buffer where data should be stored. Cannot be NULL.
* @param len number of bytes required.
*/
void get(uint8_t *data, size_t len);
#ifdef CRYPTO_BACKEND_BOTAN
/**
* @brief Returns internal handle to botan rng. Returned
* handle is always initialized. In case of
* internal error NULL is returned
*/
struct botan_rng_struct *handle();
#endif
};
} // namespace rnp
#endif // RNP_RNG_H_
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